Improvement in furnaces for steam-boilers



I 2'Sheets-Sheet1. 11,2. PARSON. FURNACES FOR STEAM-BOILERS.

Patented Feb. 6,1877.

VENUE y Milli" if Ill! ill n I 1 ni uni WITNESSES N. PETERS,FHOTD-LITHOGRAPHER, WASHINGTONv D O.

2 Sheets-sheaf 2.

I H.'E.PARSON. FURNACES FOR STEAM-BOILERS.

Patented Feb. 6, 1877.

INVENTOR WITNESSES N. FETERfi. FHOTO-UTHGGRAFHEH. WASNINGTOM, D C.

UNITED STATES PATENT OFFICE.

HENRY E. PARSON, OF WA TERTOWN, NEW YORK.

IMPROVEMENT IN FURNACES FOR STEAM-BOILERS.

. Specification forming part of Letters Patent No. 187,170, datedFebruary 6, 1877 application filed February 29. 1876. i

To all whom it may concern Be it known that I, HENRY E. PARSON, ofWatertown, in the county of Jefferson and State of New York, haveinvented certain new and useful Improvements in Furnaces forSteamBoiIers, of which the following is a specification I have found byexperiment that when coal is heated in a retort it yields volatilehydrocarbons amounting from twenty to thirty-two per cent. of itsweight, and the hydrogen robs the fuel of six times its own weight ofcarbon. When fresh fuel is added to live coal in the furnace the sameresult ensues, so that in using coal fifty to sixty-seven per cent. ofcarbon burns on the grate, and twenty to thirty-two per cent. of carbonand hydrogen have to be burned in the open space above the fuel orescape unconsumed.

To consume the smoke and gases, as above described, contained in theupper part of the chamber, is a very important and desirable result toattain. This result I accomplish in my invention by peculiar means,adapted to throw into the upper chamber or open space in the furnace,above the fuel, (under, pressure,) 2. sufficient amount of air oroxygen,in combination with the hydrogen of steam to produce perfect combustion.

This apparatus is under absolute control of the engineer, and thereforethe amount of air and steam, as required, can be increased or diminishedat will by use of a steam-blower.

The air is heated, and therefore produces, I

which blower, front nozzles, and steam-pipe are attached to the furnace,the arrows in the fire-chamber showing the direction of the blast asgiven by the peculiar construction of the nozzles. Fig. 2 is alongitudinal section of a boiler and furnace, showing the blowerattached and deflectors in the chamber, the ar-. rows in the chamberindicating the direction of the air-currents as forced into the chamberfor producing a rotary movement to the currents of heat. Fig. 3 is alongitudinal section of the blower, showing the separate passages forsteam and air, also the chamber in pipe, into which the steam and aircombine, and from' which they are delivered, through the nozzles, to thefurnace chamber. Fig.4. is a top view of one of the nozzles. Fig. 5 is alongitudinal vertical section of one of the nozzles on the line 5 5,Fig. 4.

B is my improved blower attached to the front part of the furnace underthe door J of the fire-chamber D. The blower B is constructed with aflaring mouth-piece, I, an airchamber, 0, and expanding blast-pipe F. Tothe end of the blast-pipe F is attached a pipe, F, connecting the blowerwith a pipe, F, extending upwardly into the fire-chamber and downwardlyunder and to the rear of the grate blast horizontally over the fuel,causing it to mingle with the blast proceeding from the front nozzle A.At the rear side of the chamber O of the blower is inserted a pipe, E,connecting, by means of a pipe, H, with the steambox. valve, G.

The operation is as follows: Steam, being admitted to the pipe E, passesthrough chamber O, thence into the expandingpipe F, where it combineswith the air as it is brought in through the flaring mouth-piece I. Thesteam passing through chamber 0 with great velocity, and expanding inpipe F, exhausts the air in chamber 0, and a fresh current of air rushesin to supply the vacant space.

The blower is operated by opening valve G in steam-pipe H, whichconnects with pipe E of the blower. After combination, the steam Thesteam-pipe H is provided with a and air are forced through pipes F and Fto the nozzles A and A, into chamber D. It is here distributed, asrepresented by the arrows in Figs. 1 and 2, from nozzles A and A. Bydividing the blast and carrying a part in front and a part to the backof the fuel, a still more perfect combustion is obtained than simplywith the front blast. The portion of the blastpipe under thefire-chamber being contiguous to the grate, the air passing therethroughwill be additionally heated. The blast passing out of the rear nozzleproduces a suction through the grate-bars, and, in combination with theblast from the front nozzle, compels the return of 'all unconsumed gasesand smoke, forcing them to pass over the heated coal or flame, wherebythey are all consumed in the fire-chamber.

These nozzles, combined in this way and made of the peculiar shapedescribed, and operating at certain angles with respect to each other,give a complete rotary movement to the products of combustion, andcompels these products to remain longer in the fire-chamber and tobecome thoroughly exhausted.

By this device great power and complete control of the fire areobtained.

The blower may also be used as a blast for blacksmiths forges and forsmelting-cupolas.

This device willbe found to possess the adand located in front of thefuel, to adapt it to draw the products of combustion toward theupwardly-ascending blast, substantially as and in the manner set forth.

, 2. The combination, with the blower B, consistin g of steam-pipe H andflaring mouth-piece I of the pipe F, and flattened flaring nozzles A A,the nozzle A located in front of the fuel, and adapted to direct a blastupwardly, and the nozzle A located at the rear of the fuel and adaptedto direct a blast horizontally over the fuel, causing it to mingle and.pass upwardly with that proceeding from the nozzle A, substantially asdescribed, for the purpose set forth.

HENRY E. PARSON.

Witnesses: L. H. AINSWORTH, GEo. V. NATHEY.

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